Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1997-09-02
1999-02-23
Pascal, Robert J.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315DIG7, 315219, H05B 4116
Patent
active
058748105
ABSTRACT:
A ballast for an electrodeless gas discharge lamp comprises a load circuit including an r.f. inductor for generating an r.f. field for powering the electrodeless lamp and a serially connected resonant capacitance. The inductance of the r.f. inductor has a substantial effect in determining a frequency of resonance the load circuit. A d.c.-to-a.c. converter circuit is coupled to the load circuit for inducing a.c. current therein. It comprises first and second converter switches serially connected in the foregoing order between a bus node at a d.c. voltage and a reference node, and being connected together at a common node through which the a.c. load current flows. The first and second converter switches each has a control node and a reference node, the voltage between such nodes determining the conduction state of the associated switch. The respective control nodes of the first and second converter switches are interconnected. The respective reference nodes of the first and second converter switches are interconnected at the common node. A control circuit provides a control signal on the interconnected control nodes, and comprises a driving inductor coupled between the common node and the interconnected control nodes. The driving inductor is mutually coupled to the r.f. inductor for sensing voltage across the r.f. inductor.
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Bruzga Charles E.
General Electric Company
Pascal Robert J.
Shingleton Michael
LandOfFree
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